Internet Explorer 7 is only browser that connects to the Internet

Alright, I'm not quite sure what is going on. I recently uninstalled Norton Antivirus, and once I rebooted the computer the only browser that works is Internet Explorer 7. I've turned off the Windows Firewall.

I uninstalled/reinstalled Firefox, Chrome, and Safari. Other programs (such as BitTorrent) still work, though. I upgraded Internet Explorer, and it didn't work untill I restored the computer and was using version 7 again.

I have no idea what is going on. Can anyone help? I tried restoring my computer to before I uninstalled Norton Antivirus, and it didn't help.

Any suggestions?